Cross sections for one-electron capture by highly stripped ions of B, C, N, O, F, Ne, and S from He below 1 keV/amu

Abstract

Cross sections for one-electron transfer from a He atom into the fully stripped, hydrogenlike, heliumlike, and lithiumlike ${\mathrm{B}}^{q+}$, ${\mathrm{C}}^{q+}$, ${\mathrm{N}}^{q+}$, ${\mathrm{O}}^{q+}$, ${\mathrm{F}}^{q-}$, ${\mathrm{Ne}}^{q+}$ ions, and also highly stripped ${\mathrm{S}}^{q+}$ ions have been measured at the energy range of $1.5q-3.0q$ keV. The measured cross sections are nearly independent of the collision energy with a few exceptions, and most of the cross sections measured are about (1∼4)×${10}^{-15\mathrm{}}$ ${\mathrm{cm}}^2$, but the cross sections for ${\mathrm{B}}^{4+}$, ${\mathrm{C}}^{4+}$, and ${\mathrm{N}}^{4+}$ ions are very small in the energy range studied. When the cross sections measured are plotted as a function of the ionic charge $q$ of isoelectronic projectile ions, strong oscillations in the cross sections are observed. As a first approximation, this oscillatory behavior can be explained in terms of the classical one-electron model.